JPH0586315A - Ink, method for ink jet recording using the same, and apparatus using the same - Google Patents

Abstract

PURPOSE:To provide an ink which does not adversely affects the quality of a printed record when used for recording on plain paper generally used in a business office, etc., gives the record a sufficient water resistance, and enables a high-quality printing with no problem even after being stored long, a method for ink jet recording using the ink, and an apparatus using the ink. CONSTITUTION:An ink contg. a recording agent, a liq. medium in which the agent is dissolved or dispersed, at least one compd. selected from the group consisting of urea, thiourea, their deriv., and a volatile alkali compd., and an imide compd., an ink jet recording method using the ink, and an apparatus using the ink are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink, an ink jet recording method using the same, and an apparatus using the ink. More specifically, the recorded matter has excellent water resistance and is used in general offices. Ink capable of excellent recording even on non-coated paper such as high-quality paper, neutral paper, bond paper, recycled paper, so-called plain paper and other recording materials, ink jet recording method using the same, and the like A device using ink.

[0002]

2. Description of the Related Art Writing instruments (fountain pens, felt-tip pens,
With regard to inks for water-based ballpoint pens and the like and ink jet inks, various compositions have been reported. In particular, the composition and physical properties of the ink have made it possible to perform good recording on plain paper such as copy paper, report paper, notebook, notepaper, bond paper, and continuous slip paper that are commonly used in offices in recent years. Detailed research and development has been carried out from various aspects such as. For example, JP-A-58-
No. 80366 achieves prevention of nozzle clogging by including an imide compound in an aqueous ink composition,
A water-based ink that provides an image with excellent print quality has also been proposed.

[0003]

[Problems to be solved by the invention] However,
Even in the inks capable of high-quality printing as described above, the water-soluble ink is inferior in water resistance of the recorded matter, and after printing, water droplets such as rain adhere to the recorded matter or the recorded matter is immersed in water. In that case, there is a problem that the ink flows out and the density of the printed matter is lowered. In particular, a water-based inkjet ink for obtaining a colored image is even more preferable because a dye having a high solubility in water is used in order to form an ink having a high color saturation. Further, water and a low boiling point solvent are used in the water-soluble ink composition, and if stored for a long time, these solvents evaporate with the passage of time and the ink becomes highly viscous. There is also a problem that it becomes unsuitable for ink jet recording in which ink drops are ejected from the holes, and uniform ink drops cannot be obtained.

Therefore, an object of the present invention is to provide a printed record with sufficient water resistance without adversely affecting the print quality of the printed record when recorded on plain paper or the like used in general offices. The present invention provides an ink that has high properties and is capable of high-quality printing without any problem even after storage for a long period of time, an inkjet recording method using the ink, and a device using the ink. ..

[0005]

The above object can be achieved by the present invention described below. That is, the present invention provides an ink containing a recording medium and a liquid medium in which the recording medium is dissolved or dispersed, and at least one compound selected from urea, thiourea, or a derivative compound thereof, or a volatile alkaline compound, and an imide compound. Ink characterized by having it together,
And an inkjet recording method using the same and a device using such an ink.

[0006]

The present inventor has conducted diligent studies on various ink compositions in order to improve the water resistance of printed recordings by using water-soluble inks, and as a result, in an ink containing a recording medium and a liquid medium in which the recording medium is dissolved or dispersed. In addition, when an imide compound and at least one compound selected from urea, thiourea, or a derivative compound thereof, and a volatile alkali compound are additionally contained, a print record obtained without impairing the print quality. According to the present invention, it has been found that the water resistance of an object is improved, the ink is good even after being stored for a long period of time, and that the use of such an ink does not impair the reliability of an inkjet recording system. completed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the preferred embodiments. As the imide compound used in the present invention, for example, succinimide, glutarimide, maleimide, diglycolimide, glutazine and the like are preferable. Still other specific examples include compounds represented by the following chemical formulas.

[0008]

[Chemical 1]

[Chemical 2]

[Chemical 3]

[Chemical 4]

[Chemical 5]

[Chemical 6]

[Chemical 7]

[Chemical 8]

[Chemical 9]

[Chemical 10]

[Chemical 11]

[Chemical formula 12]

[Chemical 13]

[Chemical 14]

The compounds selected from urea, thiourea or their derivative compounds used in the present invention are:
Specifically, urea; derivatives of urea such as 1,1-diethylurea, 1,3-diethylurea, 1,1-dimethylurea and 1,3-dimethylurea; thiourea; 1,1-diethylthiourea; Examples thereof include derivatives of thiourea such as 1,3-diethylthiourea, 1,1-dimethylthiourea and 1,3-dimethylthiourea. Urea has a high water-retaining effect, so addition of urea can provide an ink that has achieved clogging and prevention of solidification at low temperatures. The above imide compound and urea,
When thiourea or a derivative compound thereof is used in combination, the content of these in the ink depends on the use, purpose, coloring material type,
It is not particularly limited because it has a close relationship with the ink composition and the like. However, preferably the imide compound is 0.2-40.0 w
t /% range, more preferably 1.0 to 20.0 wt
%, And urea, thiourea or their derivative compounds are contained in the range of 0.1 to 20.0 wt /%, more preferably 0.5 to 15.0 wt /%. The combined ratio of the imide compound and urea, thiourea or their derivative compounds is preferably about 1: 2 to 5: 1.

The volatile alkaline compound used in the present invention has, for example, 1 carbon atom such as ammonia, monoethylamine, diethylamine, triethylamine, monomethylamine, dimethylamine and trimethylamine.
~ 4 alkyl amines. Conventionally, a non-volatile alkaline compound such as triethanolamine has been added as a liquid medium, but since it is a non-volatile compound, it remains in the printed matter and water droplets or the like are attached to the printed matter. It flowed out and the water resistance of the printed matter was impaired. On the other hand, a volatile alkali compound such as ammonia is volatilized during printing, and these alkalis do not remain in the printed matter, so that the water resistance can be improved. When the imide compound and the volatile alkali compound are used together, their contents in the ink are not particularly limited because they are closely related to the use, purpose, color material type, ink composition and the like. However, the imide compound is preferably 0.1 to 2
0.0 wt /% range, more preferably 0.5 to 1
It is in the range of 5.0 wt /%, and the volatile alkali compound is in the range of 0.1 to 20.0 wt /%, and more preferably in the range of 0.5 to 15.0 wt /%. The combined ratio of the imide compound and the volatile alkaline compound is preferably about 1: 1 to 8: 1.

In the present invention, for example, lithium acetate,
It is preferable to use a salt of a weak acid such as lithium hydroxide and a strong base as a buffer. Further, the proportion of the buffering agent in the ink is preferably about 0.01 wt% to 5.0 wt%.

The recording material used in the present invention is not particularly limited, and various coloring materials such as dyes and pigments are used. The amount of these coloring materials to be used is not particularly limited, but in general, the range of 0.1 to 15% by weight based on the total weight of the ink is preferable, and more preferably 0.
It is 1 to 10% by weight. The pH of the ink of the present invention is preferably adjusted to 5 to 10 by adding a pH adjusting agent. In addition to the above components, the ink of the present invention contains a water-soluble organic solvent, a surfactant, an anticorrosive agent, an antiseptic agent, an antifungal agent, an antioxidant, an evaporation accelerator, a chelating agent, and a water-soluble agent, if necessary. Various additives such as polymers may be added.

The liquid medium used in the present invention is preferably a mixture of water and a water-soluble organic solvent. Specific examples of the water-soluble organic solvent include, for example, amides such as dimethylformamide and dimethylacetamide; ketones such as acetone; ethers such as tetrahydrofuran and dioxane; polyalkylene glycols such as polyethylene glycol and polypropylene glycol; Ethylene glycol, propylene glycol, butylene glycol,
Alkylene glycols having an alkylene group of 2 to 6 carbon atoms such as triethylene glycol, 1,2,6-hexanetriol, thiodiglycol, hexylene glycol and diethylene glycol; glycerin; ethylene glycol monomethyl (or ethyl) ether , Diethylene glycol monomethyl (or ethyl) ether,
Lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl (or ethyl) ether; N
-Methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, triethanolamine, sulfolane,
Examples thereof include dimethyl sulfoxide.

The content of the water-soluble organic solvent is generally preferably 1% to 40% by weight, more preferably 3% to 30%, based on the total weight of the ink. The water content of the ink is within the range of 30 to 95% by weight. If it is less than 30% by weight, the solubility of the coloring material is deteriorated and the viscosity of the ink is increased, which is not preferable. on the other hand,
If it is more than 95% by weight, the amount of vaporized components is too large to satisfy a sufficient fixing property.

The ink of the present invention is particularly suitable when applied to an ink jet recording method of the type in which the ink is ejected by the bubbling phenomenon of the ink due to thermal energy.
The ejection is extremely stable, and satellite dots are not generated. However, in this case, a thermal property value (for example, specific heat, coefficient of thermal expansion, thermal conductivity, etc.) may be adjusted. Further, the ink of the present invention solves the problem of the water resistance of the printed matter when recorded on plain paper or the like, and at the same time improves the matching with the inkjet head, the physical properties of the ink itself are 2
It is desirable that the surface tension at 5 ° C. is adjusted to 30 to 68 dyne / cm, and the viscosity is adjusted to 15 cP or less, preferably 10 cP or less, more preferably 5 cP or less. Therefore, in order to adjust the ink to the above physical properties and solve the problem in plain paper, the amount of water contained in the ink of the present invention is 50% by weight or more and 98% by weight or less, preferably 6% by weight or less.
It is preferable that the content is 0% by weight or more and 95% by weight or less.

The ink of the present invention is particularly suitable for use in an ink jet recording method in which droplets are ejected by the action of heat energy for recording, but it can also be used for general writing instruments. As a method and apparatus suitable for performing recording using the ink of the present invention, a method and apparatus for applying thermal energy corresponding to a recording signal to the ink in the chamber of the recording head and generating droplets by the thermal energy are provided. Can be mentioned.

An example of a head structure which is a main part of the apparatus is shown in FIGS. 1, 2 and 3. The head 13 is made by bonding glass, ceramics or a plastic plate having a groove 14 through which ink is passed, and a heating head 15 (a head is shown in the drawing, but not limited to this) used for thermal recording. Obtained. The heating head 15 includes a protective film 16 made of silicon oxide and an aluminum electrode 17.
1, 17-2, a heat generating resistor layer 18 formed of nichrome, a heat storage layer 19, and a substrate 20 having a good heat dissipation property such as alumina.
It depends on and. The ink 21 reaches the ejection orifice (fine hole) 22, and the pressure P causes the meniscus 23 to reach.
Is formed. Now, when an electric signal is applied to the electrodes 17-1 and 17-2, the area indicated by n of the heating head 15 rapidly generates heat, and bubbles are generated in the ink 21 in contact with the area, and the meniscus 23 is generated by the pressure. Are ejected, the ink 21 is ejected, and becomes a recording droplet 24 from the orifice 22 and is ejected toward the recording material 25. FIG. 3 shows an external view of a multi-head in which many heads shown in FIG. 1 are arranged. The multi-head is manufactured by closely adhering a glass plate 27 having a multi-groove 26 and a heating head 28 similar to that described in FIG. 1 shows the head 13 along the ink flow path.
2 is a cross-sectional view of FIG. 2, and FIG. 2 is a sectional view taken along line AB of FIG.

FIG. 4 shows an example of an ink jet recording apparatus incorporating such a head. In FIG. 4, reference numeral 61 denotes a blade as a wiping member, one end of which is held by a blade holding member to become a fixed end, which is in the form of a cantilever. The blade 61 is arranged at a position adjacent to the recording area of the recording head, and in the case of this example, it is held in a protruding form in the moving path of the recording head. Reference numeral 62 denotes a cap, which is arranged at a home position adjacent to the blade 61, and has a configuration that moves in a direction perpendicular to the moving direction of the recording head and abuts the ejection port surface to perform capping. Further, 63 is an ink absorber provided adjacent to the blade 61, and like the blade 61,
The recording head is held in a protruding form in the moving path of the recording head.
The blade 61, the cap 62, and the absorber 63 constitute a discharge recovery unit 64, and the blade 61 and the absorber 6
3 removes water, dust and the like from the ink ejection port surface.

Reference numeral 65 denotes a recording head which has an ejection energy generating means and ejects ink to a recording material facing the ejection port surface where the ejection port is arranged to perform recording, and 66 is equipped with the recording head 65. It is a carriage for moving the recording head 65. The carriage 66 is slidably engaged with the guide shaft 67, and a part of the carriage 66 is connected (not shown) to a belt 69 driven by a motor 68. As a result, the carriage 66 can move along the guide shaft 67, and the recording head 65 can move the recording area and its adjacent area. Reference numeral 51 is a paper feed section for inserting a recording material, and 52 is a paper feed roller driven by a motor (not shown). With these configurations, the recording material is fed to a position facing the ejection opening surface of the recording head, and is ejected to the ejection section provided with the ejection roller 53 as the recording progresses.

In the above structure, when the recording head 65 returns to the home position due to the end of recording or the like, the cap 62 of the head recovery section 64 is retracted from the movement path of the recording head 65, but the blade 61 projects into the movement path. There is. As a result, the ejection port surface of the recording head 65 is wiped. When the cap 62 comes into contact with the ejection surface of the recording head 65 to perform capping, the cap 62 moves so as to project into the movement path of the recording head. Recording head 6
When 5 moves from the home position to the recording start position, the cap 62 and the blade 61 are at the same positions as the above-mentioned positions at the time of wiping. As a result, the ejection opening surface of the recording head 65 is wiped even during this movement. To move the recording head to the home position,
Not only at the end of recording or at the time of ejection recovery, the recording head moves to the home position adjacent to the recording area at a predetermined interval while moving in the recording area for recording, and the wiping is performed with this movement. .

FIG. 5 is a diagram showing an example of an ink cartridge in which ink is supplied to the head through an ink supply member, for example, a tube. Here, 40 is an ink containing portion containing the supply ink, for example, an ink bag, and a rubber stopper 42 is provided at the tip thereof. By inserting a needle (not shown) into this stopper 42, the ink in the ink bag 40 can be supplied to the head. 44
Is an absorber that receives waste ink. It is preferable for the present invention that the surface of the ink containing portion which is in contact with the ink is formed of polyolefin, particularly polyethylene. The ink jet recording apparatus used in the present invention is not limited to the one in which the head and the ink cartridge are separately provided as described above, but is also preferably used in the one in which they are integrated as shown in FIG.

In FIG. 6, reference numeral 70 denotes a recording unit, in which an ink containing portion containing ink, for example, an ink absorber is contained, and the ink in the ink absorber has a plurality of orifices. Head portion 71
It is configured to be ejected as an ink droplet from. It is preferable for the present invention to use polyurethane, cellulose or polyvinyl acetal as the material of the ink absorber. Reference numeral 72 is an atmosphere communication port for communicating the inside of the recording unit with the atmosphere. This recording unit 70 is shown in FIG.
The recording head is used instead of the recording head and is detachable from the carriage 66.

[0023]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. In the text, "part" and "%" are based on weight unless otherwise specified.

Examples 1 to 11 The components shown below were mixed, thoroughly stirred and dissolved, and then pressurized with a fluoropore filter (trade name: manufactured by Sumitomo Electric Industries, Ltd.) having a pore size of 0.45 μm. After filtering, the inks of the examples of the present invention were prepared. Ink composition of Example 1 C.I. I. Hood black 2
Part 4 ・ Glycerin
5 parts ・ Ethyl alcohol
2 parts Urea
5 parts ・ Succinimide
10 copies of water
74 copies

Ink composition of Example 2 C.I. I. Direct black 154
3 parts ・ Diethylene glycol
10 parts-Urea
3 parts ・ 1,1-diethylurea
4 parts ・ Glutarimide
6 parts ・ Water
74 copies

Ink composition of Example 3 C.I. I. Direct black 154
5 parts ・ Diethylene glycol
10 parts ・ Isopropyl alcohol
2 parts ・ 1,1-diethylurea
4 parts ・ Succinimide
6 parts ・ Water
73 copies

Ink composition of Example 4 C.I. I. Acid Red 35
Part 2 ・ Glycerin
7 parts ・ Isopropyl alcohol
3 parts ・ Thiourea
7 parts ・ Succinimide
16 copies ・ Water
65 copies

Ink composition of Example 5 C.I. I. Hood black 2
Part 4 ・ Glycerin
5 parts ・ Ethyl alcohol
2 parts ・ Triethylamine
5 parts ・ Succinimide
7 copies of water
77 copies

Ink composition of Example 6 C.I. I. Direct black 154
3 parts ・ Diethylene glycol
10 parts ・ Ammonia
6 parts succinimide
8 parts ・ Water
73 copies

Ink composition of Example 7 C.I. I. Direct black 154
5 parts ・ Diethylene glycol
10 parts ・ Isopropyl alcohol
2 parts monoethylamine
2 parts ・ Glutarimide
12 copies of water
69 copies

Ink composition of Example 8 C.I. I. Acid Red 35
Part 2 ・ Glycerin
7 parts ・ Isopropyl alcohol
3 parts ・ Ammonia
3 parts ・ Succinimide
10 copies of water
75 copies

Ink composition of Example 9 C.I. I. Hood black 2
Part 4 ・ Glycerin
5 parts ・ Ethyl alcohol
2 parts ・ Lithium acetate
1 part ・ 1,3-diethylthiourea
3 parts ・ Succinimide
8 parts-Compound 13
2 parts ・ Water
75 copies

Ink composition of Example 10 C.I. I. Hood black 2
2 parts ・ Thioglycol
10 parts ・ Isopropyl alcohol
1 part ・ 1,1-diethylurea
3 parts ・ Succinimide
12 copies of water
72 copies

Ink composition of Example 11 C.I. I. Hood black 2
Part 2 ・ Glycerin
7 parts ・ Isopropyl alcohol
3 parts ・ Lithium hydroxide
1 part ・ 1,1-dimethylurea
3 parts ・ Glutarimide
16 copies ・ Water
68 copies

Comparative Examples 1 to 6 The following components were mixed, thoroughly stirred and dissolved, and then pressurized with a fluoropore filter (trade name: manufactured by Sumitomo Electric Industries, Ltd.) having a pore size of 0.45 μm. After filtering, each ink of the comparative example was prepared.

Ink composition of Comparative Example 1 C.I. I. Direct black 154
3 parts ・ Diethylene glycol
10 parts ・ Isopropyl alcohol
7 copies of water
80 copies

Ink composition of Comparative Example 2 C.I. I. Hood black 2
4 parts ・ Triethylene glycol
10 copies of water
86 copies

Ink composition of Comparative Example 3 C.I. I. Direct black 154
3 parts ・ Diethylene glycol
10 parts ・ Isopropyl alcohol
4 parts ・ Glutarimide
4 parts ・ Water
79 copies

Ink Composition of Comparative Example 4 C.I. I. Direct black 154
3 parts ・ Diethylene glycol
10 parts ・ Isopropyl alcohol
7 parts ・ Triethanolamine
4 parts ・ Water
76 copies

Ink composition of Comparative Example 5 C.I. I. Hood black 2
Part 3 ・ Glycerin
5 parts ・ 1,1-dimethylurea
10 parts ・ Triethanolamine
2 parts ・ Isopropyl alcohol
3 parts ・ Water
77 copies

Ink composition of Comparative Example 6 C.I. I. Direct black 154
3 parts ・ Diethylene glycol
10 parts ・ Isopropyl alcohol
7 parts ・ Lithium hydroxide
Part 1 ・ Water
79 copies

Next, an on-demand type ink jet printer using the inks of Examples 1 to 12 and Comparative Examples 1 to 6 obtained and using a heating element as an ink discharge energy source is used as an ink jet recording apparatus. A printing test was conducted using the above-mentioned products, and (1) water resistance, (2) frequency response, and (3) printing quality were evaluated according to the following criteria, respectively. The obtained results are shown in Tables 1 and 2. still,
The printing conditions of the above-mentioned ink jet recording apparatus are as follows: drive voltage 26 V, resistance value of heating resistor 150 Ω, frequency 4
Performed at KHz.

[Evaluation Method and Evaluation Criteria] (1) Water Resistance After filling a predetermined ink in a printer and printing alphanumeric characters and solid parts on commercially available high-quality paper, printing is stopped,
After left for 1 hour or more, the print density is measured by Macbeth RD915 (trade name: manufactured by Macbeth). After that, the printed matter is dipped in a container filled with water for 3 minutes, left to stand and dried to measure the printed density again, and the residual rate of the printed matter density is obtained.
Water resistance was evaluated. ◯: The residual rate of printed matter density is 80% or more. X: The residual density of the printed matter is 65% or less.

(2) Frequency response The printed state of the obtained printed matter, that is, the state of blurring or white spots and the state of defective landing point such as slushing or twisting was visually observed and evaluated. ◯: The ink follow-up condition with respect to the frequency is almost good, and there is no blur, white spots, or defective landing point in character printing, but slight blur is observed in solid printing. Δ: No smearing or white spots are observed in character printing, but defective landing points are partially observed. Further, in solid printing, blurring and white spots are seen in about 1/3 of the whole solid printing. X: Many solid lines and white spots in solid printing, and many small lines and defective landing points in character printing.

(3) Evaluation of printing quality After printing alphanumeric characters on a commercially available high-quality paper with a printer and leaving it for 1 hour or more, the sharpness of the characters and the degree of the whisker-like bleeding caused by the characters are visually observed with a microscope. evaluated. ⊚: Characters are sharp and have no beard-like bleeding. ◯: The characters are sharp, but some beard-like bleeding occurs. Δ: Characters are not sharp. Or, there are many beard-like blurs. X: Characters are not sharp and have many beard-like blurs.

[0046]

[Table 1] Table 1

[0047]

[Table 2] Table 2

[0048]

As described above, according to the ink of the present invention, the printed matter can be printed on so-called plain paper such as high quality paper, neutral paper, bond paper and recycled paper used in general offices. The water resistance of the printed matter can be improved without adversely affecting the quality. Furthermore, according to the ink of the present invention, the ink is good even after being stored for a long period of time, and it is possible to perform highly reliable recording as an inkjet recording system without any problems.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a head portion of an inkjet recording apparatus.

FIG. 2 is a cross-sectional view of a head portion of an inkjet recording device.

3 is an external perspective view of a head in which the head shown in FIG.

FIG. 4 is a perspective view showing an example of an inkjet recording apparatus.

FIG. 5 is a vertical sectional view of an ink cartridge.

FIG. 6 is a perspective view of a recording unit.

[Explanation of symbols]

 61: Wiping member 62: Cap 63: Ink absorber 64: Ejection recovery section 65: Recording head 66: Carriage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kumiko Mafune 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (15)

[Claims] 1. An ink containing a recording material and a liquid medium in which the recording material is dissolved or dispersed, and at least one compound selected from urea, thiourea, or a derivative compound thereof, or a volatile alkali compound, and an imide compound are used together. Ink characterized by having. 2. The ink according to claim 1, wherein the volatile alkaline compound is selected from ammonia and its derivatives. 3. An ink jet recording method for ejecting ink droplets from an orifice in response to a recording signal to perform recording on a recording material, wherein the ink is the ink according to claim 1. .. 4. The ink jet recording method according to claim 3, wherein thermal energy is applied to the ink to eject ink droplets. 5. A recording unit comprising an ink containing section containing ink and a head section for ejecting the ink as ink droplets, wherein the ink is the ink according to claim 1. unit. 6. The recording unit according to claim 5, wherein the head portion is a head that causes thermal energy to act on the ink to eject ink droplets. 7. The recording unit according to claim 5, wherein the ink containing portion is formed of polyurethane, cellulose, or polyvinyl acetate. 8. An ink cartridge provided with an ink containing portion containing ink, wherein the ink is the ink according to claim 1. 9. The ink cartridge according to claim 8, wherein the ink containing portion has a liquid contact surface formed of polyolefin. 10. An ink according to claim 1, wherein the ink is an ink-jet recording apparatus having a recording unit having an ink containing portion containing the ink and a head portion for ejecting the ink as ink droplets. An ink jet recording apparatus characterized by the above. 11. The head unit is a head for ejecting ink droplets by applying thermal energy to the ink.
0. The inkjet recording device according to item 0. 12. The ink jet recording apparatus according to claim 10, wherein the ink containing portion is made of polyurethane, cellulose, or polyvinyl acetate. 13. A recording head for ejecting ink droplets,
The ink according to claim 1, wherein the ink is an ink cartridge having an ink containing portion containing ink, and an ink supply device for supplying the ink from the ink cartridge to a recording head. Characteristic inkjet recording device. 14. The ink jet recording apparatus according to claim 13, wherein the recording head is a head which applies thermal energy to ink to eject ink droplets. 15. The ink jet recording apparatus according to claim 13, wherein the ink containing portion has a liquid contact surface formed of polyolefin.